Across
- 3. A substance which exists in the solid-state, which is one of the four fundamental states of matter.
- 8. Are made up of neutrons, protons and electrons
- 9. A substance that can be dissolved by a solvent to create a solution
- 11. A silvery-white metallic chemical element in the periodic table, with atomic number 92.
- 12. A substance made up of two or more different chemical elements combined in a fixed ratio.
- 14. Are the simplest forms of matter.
- 15. Is made up of atoms
- 17. A chemical process in which a substance reacts rapidly with oxygen and gives off heat.
- 19. A colourless, odourless, highly flammable gas, the chemical element of atomic number 1
- 20. An atom or group of atoms that has an electric charge.
- 21. The process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water.
- 25. A transition metal and a group 11 element.
- 26. A chemical process in which a substance reacts rapidly with oxygen and gives off heat.
- 27. Are opaque, lustrous elements that are good conductors of heat and electricity.
- 29. The particle in the atomic nucleus with a mass = 1 and charge = 0.
Down
- 1. One of the alkaline-earth metals of Group 2 (IIa) of the periodic table, and the lightest structural metal.
- 2. A substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.
- 4. A physical combination of two or more substances that aren't chemically joined.
- 5. The chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series
- 6. A substance that is in a gaseous, or vaporous, state of matter.
- 7. A negatively charged subatomic particle that can be either bound to an atom or free (not bound).
- 10. A subatomic particle with a positive electric charge.
- 13. A chemical element with the symbol He and atomic number 2.
- 16. Any substance, usually liquid, which is capable of dissolving one or several substances, thus creating a solution.
- 18. The processes by which chemicals interact to form new chemicals with different compositions.
- 22. A soft metal, reactive and with a low melting point, with a relative density of 0,97 at 20ºC
- 23. Any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.
- 24. The chemical process by which organic compounds release energy.
- 28. A type of matter with specific properties that make it less rigid than a solid but more rigid than a gas.